"CHiPs" is an acronym for California Highway Patrol. It is also the name of a popular television program which ran on NBC from 1977 to 1983. "CHiPs" starred Erik Estrada and Larry Wilcox (and later Tom Reilly) as CHP officers "Ponch" and "Jon" (and "Bobby").
Each week, these officers were shown riding their motorcycles through southern California as they kept the Los Angeles streets and freeways safe for citizens like you and me.

When TNT aired "CHiPs" regularly, a member of the TNT programming department admitted that they had "no good reason" for showing the episodes out of order. However, airing episodes out of order makes it easier to organize "theme weeks" and popular episodes can air more often (ie: not so many episodes without Wilcox).
The episodes on the DVDs are in their original broadcast order.

There are none scheduled at this time.
Previous marathons were the "New Year's Day 'CHiPs' Marathon" in 1995, another marathon on May 11, 1995 (the night this site was created), on June 19, 1997 from Noon to 4pm, and October 23, 1998.

Yes. CHiPs '99 first aired on Turner Network Television on October 27, 1998. For more information about this reunion movie, see the "CHiPs" Wiki.
There is also a motion picture in the works. A release date has not been set, but it is expected to be released in 2009.

Larry Wilcox reportedly left the series because he didn't get along well with Erik Estrada. The reasoning on the show was that Jon went to work on his father's farm in Wyoming. So in "Meet the New Guy", Ponch got Bobby "Hot Dog" Nelson as a new partner. (About 1,800 people auditioned for the role of Bobby before the 23 year-old Tom Reilly got the job.) Nelson's younger brother, Bruce, also joined in as a trainee later that season.

Yes. Apparently, by the end of the last season, Mr. Reilly fell out of favor with Erik. Also, in December of 1982, he was arrested for possession of marijuana. In some of the last episodes, Bruce Penhall became Estrada's new partner. Penhall did an interview in May 1983 saying he expected to return to "CHiPs" in a 7th season. It was not to be. The show got cancelled.

Penhall was a championship motorcycle racer before he became Cadet Bruce Nelson on "CHiPs". He was a millionaire before even taking the role. For "CHiPs", he reportedly was paid $4,000 per episode.
Now he's an accomplished boat racer and has his own line of sunglasses.

Most of the big car-wreck and chase scenes were filmed on two stretches of freeway not yet in operation. The first few seasons, they were building the I-210 out in the San Fernando Valley and so they used that stretch a lot.
In the last few seasons, the I-210 link had already been opened, so they moved to the Long Beach end of the I-710 freeway (I-710 was CA-7 back then), where they were building about a 2-mile stretch.